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PH-EP-2015-193

(Submitted on 28 Jul 2015)

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Abstract

An algorithm is described for tagging the flavour content at production of
neutral $B$ mesons in the LHCb experiment. The algorithm exploits the
correlation of the flavour of a $B$ meson with the charge of a reconstructed
secondary charm hadron from the decay of the other $b$ hadron produced in the
proton-proton collision. Charm hadron candidates are identified in a number of
fully or partially reconstructed Cabibbo-favoured decay modes. The algorithm is
calibrated on the self-tagged decay modes $B^+ \to J/\psi \, K^+$ and $B^0 \to
J/\psi \, K^{*0}$ using $3.0\mathrm{\,fb}^{-1}$ of data collected by the LHCb
experiment at $pp$ centre-of-mass energies of $7\mathrm{\,TeV}$ and
$8\mathrm{\,TeV}$. Its tagging power on these samples of $B \to J/\psi \, X$
decays is $(0.30 \pm 0.01 \pm 0.01) \%$.

Figures and captions

Mistag probability $\omega$ as a function of the predicted mistag probability $\eta$ for the $ B ^+\!\rightarrow { J \mskip -3mu/\mskip -2mu\psi \mskip 2mu} K ^+ $ data sample. A straight line fit to extract the parameters $p_0$ and $p_1$ is superimposed. The dark (green) and light (yellow) bands are the regions within $1\sigma$ and $2\sigma$ of the fitted value, respectively.

This ZIP file contains supplemetary material for the publication
LHCb-PAPER-2015-027. The files are:
supplementary.pdf : An overview of the extra figures
*.pdf, *.png, *.eps : The figures in various formats